Imagine having a 12 high stair in place with a riser height of 9 and a tread depth of 9.
Building basement stairs code.
A prime example is the standard stair width.
Building codes often require insulation and moisture barriers.
From the top flight of stairs to the bottom of the stairs each individual riser cannot exceed a difference of 3 8 of an inch.
There may be local or state building codes for how many inches off center you can space studs such as 16 or 24 inches apart and how much clearance you need for ceilings landings for the bottom of stairs and the height and depth of the steps.
This stair would have 16 treads 9 deep for a total run of 11 3.
Minimum 10 inch stair tread depth with nosing or minimum 11 inches with no nosing.
Irc stair railing code.
At the same time staircase code measurements do allow for some flexibility since most measurements are accompanied by minimums or maximums.
The international residential code for one and two family dwellings irc and the international building code ibc address staircase railings.
Nosings are required to overhang a minimum of in.
Minimum 6 8 headroom height clearance for stairway.
As long as the 3 foot width standard is met you can expand the stairs width as far as you wish.
The nosing on treads believe it or not has a code minimum and maximum of how far the nosing projects over the next stair.
Maximum 7 3 4 inch stair riser height.
These are two model codes and are offered as suggested guidelines for local code authorities to follow at their discretion.
To a maximum of 1 in.